Perhaps a moderator should review Wrath of the Weak. It's black metal esque ambient, and based on listening to their three full-lengths, the music doesn't really have any kind of guitar riffs. Just a noisy wall of guitars and synth melodies.

Corroosion was added in 2006, the only release the band had as of 2006 was a demo that appears to have been under the name "Hekatomb". Their material since then has been deathcore, which has some death metal, but it seems to be at least 50% more or less right out of the book of The Acacia Strain, with a bunch of blast beats and trem picking between the breakdowns and chugga-chugga parts. http://www.metal-archives.com/bands/Cor ... iscography

I can't find the 2007 EP, but the 2008 EP is pure deathcore with almost no metal at all.